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' 1,628,367 May 10 1927. A. F- LAKE BELL Filed Jan. 2. 1926 gwvemtw ammga Patented May 10, 1927.

UNITED STATES ALLAN LAKE, OF OAKLAND, CALIl OBNIA,

ASSIGfiOR TO LAKE MFG. 00., OF SAN FRANCISCO, CALIFORNIA, A CORPORATION OF CALIFORNIA.

BELL.

Application filed January My invention relates to audible signaling apparatus and in particular to bell constructions.

The primary object of the invention 1s the provision of a novel construction of single stroke alternating current bell. Another object of the invention is theprovision of an improved solenoid bell striker wherein simplicity of construction is combined with maximum efiiciency of operation. A further object of the invention is the provision of a single stroke bell for use on an alternating current wherein the use ofsprings is eliminated, and chattering prevented.

'ith these and such other objects in view as will be apparent from the description, the invention iesides in the novel combination, cons'ruction, and arrangement of parts hereinafter described. and claimedandillustrated in the accompanying drawings wherein Figure 1 is a longitudinal vertical section through a bell assembly constructed in accordance with the principles of the inven tion. with the gong and parts of the striker wlongitudinal mechanism being shown in elevation;

Figure 2 is a, group elevation of theele ments comprising the striker and striker mounting. 1

In detail the invention comprises a wind ing 10 comprising a solenoid spool, the leads 11 and 12 of which extend-throu h one of the spool heads 13 and are adapte for connection in an alternating current circuit. The core of the solenoid is formed'wit-h a hollow brass tube, as a sleeve 14 which extends beyond the s 001 head 13 at one end of the solenoid and 0nd the spool head 15 at the opposite end t ereof, the extremities of the tube being externally threaded for receiving thereover cap nuts 16 and 17' respectively disposed upon opposite ends. Disposed over the solenoid spool is a cover or casing 18 which protects the solenoid winding.

The cap nut 16 is provided with a central cylindrical recess 19 adapted to receive the threaded extension of the brasstube 14 and also to form a seat for the lower end of a steel cylinder 20 loosely slidable longitudinally within the tube 14.

A bracket 21 is adapted to be secured by suitable fastenin means such as the screw 22 to the face 0 a vertical wall or support 23, theJbracket having a horizontally ex- 2, was. Serial m. 78,900.

tending arm 24 aperturcd to engage over the lower end of the tube 14 and to be clamped between the lower spool head 12; and the cap nut r16 whereby the solenoid is rigidly supported on the horizontal arm of the bracket in a vertical position.

Seated within the upper end of the brass tube 14 is a hollow steel tube 25 in the form of a bushing through which is :=lidably rereived the stem 26 of a bronze sfriker provided at its upper end with an enlarged striker head 27 adapted for contact against a'gong 28 disposed in any suitable manner adjacent the solenoid. The cap nut 17 is formed with an internally annularshoulder 29 between which. and the upper end of the tube 14, is retained an annular head 30 formed integral with the bushing 25 whereby upon screwing down the cap nut the bushing is anchored inposition. T he lower end 31 of the steel bushing 25 terminates.

short of thecenter of the solenoid while the stem 26 of the strikerextends an appreciable distance below the end of the bushing. The head of the cap nut 17 is provided with a bore extending therethrough which receives the striker head 27 forming a ide therefor, the lower end of the striker ead being seated on the top of the bushing 25 in the retracted position of the striker.

The steel cylinder 20 which is normally seated on the bottom of the recess 19 in the lower cap. nut 16 is slightly tapered at its- (ill against the lower end of the striker stem 26, impelling the striker head upwardly against the gong 28 to produce a single stroke upon the bell. The clearance tween the tip of the striking head 27 and the gong 28 is such that after contact with the gong the striker head will "fall back by gravity to clear the gong, the lower end-of its stem 26 resting upon the top 33 of the cylinder 20 which is retained in engagement with the bottom 31 of the steel bush 25 as long as the solenoid is energized. 's clearance of the non-magnetic striker from the gong eliminates any possibility of chattering which would occur otherwise. The tapered formation of the top 33 of the steel cylinder prevents sticking due to residual magnetism and immediately upon an interruption of the current circuit the solenoid will he deencr ized permitting the cylinder 20 to drop bacr within the recem 19 of the lower cap nut whereupon the striker will be lowered to its original position as illustrated in Figure 1. it is apparent that no delicate adjustment of parts 18 necessary in the present construction as due to the striking imetus of the cylinder 20 the striker head will as projected upwardly to contact with the gong with considerable force.

While 1 have illustrated and described certain details entering into the construction and operation of the apparatus, I desire it to be understood that the invention is not to belimited thereby but that any desired changes and modifications may be made in the structural details as will fall within the scope of the invention as claimed.

1 claim:

An audible si al apparatus comprising a so a magnetic bushing disposed in the u per end of said sleeve; a head on said bus mg and extending laterally over the up er end of said sleeve for suspending said ushing within said sleeve; :1 member threaded over the externally threaded upper end of said sleeve for clampin the head of said bushing against the en of said sleeve, a striker slidably disposed through said bushing; a ma etically controlled member dis sed in sai sleeve for projecting said strifi r into forcible contact a inst said sound producin element; an a closure member interna ly threaded to engage over the lower end of said sleeve and secure mid coil to :1. Sup port.

In testimony whereof I have allixed my signature.

ALLAN F. LAKE. 

